Fix QSMediaControllerSkipToNextMicrobenchmark perf regression

By caching flag check function in case perf regression by frequently
check Flags.checkLockscreenGoneTransition state in
VisualStabilityCoordinator during updateAllowedStates

Fix: 390757061
Flag: com.android.systemui.check_lockscreen_gone_transition
Test: forrest test on
  v2/android-crystalball-eng/health/microbench/systemui/main/systemui-media-1-jank-suite
Change-Id: Ie702ebcb7f7b8eb4150551d0cfc506a77c71c33a